Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

5. Integumentary System

Introduction to the Integumentary System

Anatomy & Physiology

5. Integumentary System

Introduction to the Integumentary System

Previous problemNext problem

Struggling with Anatomy & Physiology?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Why does a tattoo begin to lose its sharp lines as time goes by?

Because sweat glands dissolve the ink over time.

Because the tattoo ink evaporates through the skin surface.

Because immune cells gradually break down and disperse the ink particles in the dermis.

Because the ink is only deposited in the epidermis, which sheds frequently.

Previous problemNext problem

Verified step by step guidance

Step 1: Understand the structure of the skin. The skin consists of three main layers: the epidermis (outer layer), dermis (middle layer), and hypodermis (deepest layer). Tattoos are deposited in the dermis, which is more stable than the epidermis that sheds frequently.

Step 2: Learn about the immune system's role in tattoo fading. The dermis contains immune cells, such as macrophages, which are responsible for identifying and breaking down foreign particles, including tattoo ink.

Step 3: Recognize the process of ink dispersion. Over time, macrophages attempt to break down the ink particles in the dermis. While they cannot completely remove the ink, they gradually disperse the particles, causing the tattoo to lose its sharp lines.

Step 4: Eliminate incorrect options. Sweat glands do not dissolve ink, and ink does not evaporate through the skin surface. Additionally, the ink is not deposited in the epidermis, which sheds frequently, but rather in the dermis.

Step 5: Conclude that the correct answer is: 'Because immune cells gradually break down and disperse the ink particles in the dermis,' based on the biological processes occurring in the skin.